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Lease Commitments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2011 Facility
Leases Disclosure [Line Items]
Number of hospital facilities	4

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- Details

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Namespace Prefix:	uhs_
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Period Type:	duration

X

- Definition

Number of hospital facilities

+ References

No definition available.

+ Details

Name:	uhs_NumberOfHospitalFacilities
Namespace Prefix:	uhs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration